/* * Copyright 1999-2005 The Apache Software Foundation. *  * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at *  *      http://www.apache.org/licenses/LICENSE-2.0 *  * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.apache.log4j.or;import org.apache.log4j.Layout;/**   Render {@link ThreadGroup} objects in a format similar to the   information output by the {@link ThreadGroup#list} method.   @author Ceki G&uuml;lc&uuml;   @since 1.0 */public class ThreadGroupRenderer implements ObjectRenderer {  public  ThreadGroupRenderer() {  }    /**     Render a {@link ThreadGroup} object similar to the way that the     {@link ThreadGroup#list} method output information.      <p>The output of a simple program consisting of one     <code>main</code> thread is:     <pre>     java.lang.ThreadGroup[name=main, maxpri=10]         Thread=[main,5,false]     </pre>          <p>The boolean value in thread information is the value returned     by {@link Thread#isDaemon}.       */  public  String  doRender(Object o) {    if(o instanceof ThreadGroup) {      StringBuffer sbuf = new StringBuffer();      ThreadGroup tg = (ThreadGroup) o;      sbuf.append("java.lang.ThreadGroup[name=");      sbuf.append(tg.getName());      sbuf.append(", maxpri=");      sbuf.append(tg.getMaxPriority());      sbuf.append("]");      Thread[] t = new Thread[tg.activeCount()];      tg.enumerate(t);      for(int i = 0; i < t.length; i++) {	sbuf.append(Layout.LINE_SEP);		sbuf.append("   Thread=[");	sbuf.append(t[i].getName());	sbuf.append(",");	sbuf.append(t[i].getPriority());	sbuf.append(",");	sbuf.append(t[i].isDaemon());	sbuf.append("]");      }      return sbuf.toString();    } else {      // this is the best we can do      return o.toString();    }      }}